Heather A Lowers
Heather Lowers is a Research Geologist with the Geology, Geophysics, and Geochemistry Science Center.
Science and Products
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A multifaceted approach to particle analysis A multifaceted approach to particle analysis
[No abstract available]
Authors
H.A. Lowers
Understanding contaminants associated with mineral deposits Understanding contaminants associated with mineral deposits
Interdisciplinary studies by the U.S. Geological Survey (USGS) have resulted in substantial progress in understanding the processes that controlthe release of metals and acidic water from inactive mines and mineralized areas,the transport of metals and acidic water to streams, andthe fate and effect of metals and acidity on downstream ecosystems. The potential environmental effects...
Authors
Philip L. Verplanck
Preliminary analytical results for a mud sample collected from the LUSI Mud Volcano, Sidoarjo, East Java, Indonesia Preliminary analytical results for a mud sample collected from the LUSI Mud Volcano, Sidoarjo, East Java, Indonesia
On May 29, 2006, mud and gases began erupting unexpectedly from a vent 150 meters away from a hydrocarbon exploration well near Sidoarjo, East Java, Indonesia. The eruption, called the LUSI (Lumpur 'mud'-Sidoarjo) mud volcano, has continued since then at rates as high as 160,000 m3 per day. At the request of the United States Department of State, the U.S. Geological Survey (USGS) has...
Authors
Geoffrey S. Plumlee, Thomas J. Casadevall, Handoko T. Wibowo, Robert J. Rosenbauer, Craig A. Johnson, George N. Breit, Heather Lowers, Ruth E. Wolf, Philip L. Hageman, Harland L. Goldstein, Michael W. Anthony, Cyrus J. Berry, David L. Fey, Gregory P. Meeker, Suzette A. Morman
Chemistry, mineralogy, and petrology of amphibole in Mount St. Helens 2004-2006 dacite Chemistry, mineralogy, and petrology of amphibole in Mount St. Helens 2004-2006 dacite
Textural, compositional, and mineralogical data are reported and interpreted for a large population of clinoamphibole phenocrysts in 22 samples from the seven successive dacite spines erupted at Mount St. Helens between October 2004 and January 2006. Despite the uniformity in bulk composition of magma erupted since 2004, there is striking textural and compositional diversity among...
Authors
Carl R. Thornber, John S. Pallister, Heather Lowers, Michael C. Rowe, Charlie Mandeville, Gregory P. Meeker
Petrology of the 2004-2006 Mount St. Helens lava dome -- implications for magmatic plumbing and eruption triggering Petrology of the 2004-2006 Mount St. Helens lava dome -- implications for magmatic plumbing and eruption triggering
Eighteen years after dome-forming eruptions ended in 1986, and with little warning, Mount St. Helens began to erupt again in October 2004. During the ensuing two years, the volcano extruded more than 80×106 m3 of gas-poor, crystal-rich dacite lava. The 2004-6 dacite is remarkably uniform in bulk-rock composition and, at 65 percent SiO2 , among the richest in silica and most depleted in
Authors
John S. Pallister, Carl R. Thornber, Katharine V. Cashman, Michael A. Clynne, Heather Lowers, Charlie Mandeville, Isabelle K. Brownfield, Gregory P. Meeker
Trace elements in hydrothermal quartz: Relationships to cathodoluminescent textures and insights into vein formation Trace elements in hydrothermal quartz: Relationships to cathodoluminescent textures and insights into vein formation
High-resolution electron microprobe maps show the distribution of Ti, Al, Ca, K, and Fe among quartz growth zones revealed by scanning electron microscope-cathodoluminescence (SEM-CL) from 12 hydrothermal ore deposits formed between ???100 and e1750 ??C. The maps clearly show the relationships between trace elements and CL intensity in quartz. Among all samples, no single trace element
Authors
B.G. Rusk, H.A. Lowers, M.H. Reed
Science and Products
Filter Total Items: 32
No Result Found
Filter Total Items: 109
A multifaceted approach to particle analysis A multifaceted approach to particle analysis
[No abstract available]
Authors
H.A. Lowers
Understanding contaminants associated with mineral deposits Understanding contaminants associated with mineral deposits
Interdisciplinary studies by the U.S. Geological Survey (USGS) have resulted in substantial progress in understanding the processes that controlthe release of metals and acidic water from inactive mines and mineralized areas,the transport of metals and acidic water to streams, andthe fate and effect of metals and acidity on downstream ecosystems. The potential environmental effects...
Authors
Philip L. Verplanck
Preliminary analytical results for a mud sample collected from the LUSI Mud Volcano, Sidoarjo, East Java, Indonesia Preliminary analytical results for a mud sample collected from the LUSI Mud Volcano, Sidoarjo, East Java, Indonesia
On May 29, 2006, mud and gases began erupting unexpectedly from a vent 150 meters away from a hydrocarbon exploration well near Sidoarjo, East Java, Indonesia. The eruption, called the LUSI (Lumpur 'mud'-Sidoarjo) mud volcano, has continued since then at rates as high as 160,000 m3 per day. At the request of the United States Department of State, the U.S. Geological Survey (USGS) has...
Authors
Geoffrey S. Plumlee, Thomas J. Casadevall, Handoko T. Wibowo, Robert J. Rosenbauer, Craig A. Johnson, George N. Breit, Heather Lowers, Ruth E. Wolf, Philip L. Hageman, Harland L. Goldstein, Michael W. Anthony, Cyrus J. Berry, David L. Fey, Gregory P. Meeker, Suzette A. Morman
Chemistry, mineralogy, and petrology of amphibole in Mount St. Helens 2004-2006 dacite Chemistry, mineralogy, and petrology of amphibole in Mount St. Helens 2004-2006 dacite
Textural, compositional, and mineralogical data are reported and interpreted for a large population of clinoamphibole phenocrysts in 22 samples from the seven successive dacite spines erupted at Mount St. Helens between October 2004 and January 2006. Despite the uniformity in bulk composition of magma erupted since 2004, there is striking textural and compositional diversity among...
Authors
Carl R. Thornber, John S. Pallister, Heather Lowers, Michael C. Rowe, Charlie Mandeville, Gregory P. Meeker
Petrology of the 2004-2006 Mount St. Helens lava dome -- implications for magmatic plumbing and eruption triggering Petrology of the 2004-2006 Mount St. Helens lava dome -- implications for magmatic plumbing and eruption triggering
Eighteen years after dome-forming eruptions ended in 1986, and with little warning, Mount St. Helens began to erupt again in October 2004. During the ensuing two years, the volcano extruded more than 80×106 m3 of gas-poor, crystal-rich dacite lava. The 2004-6 dacite is remarkably uniform in bulk-rock composition and, at 65 percent SiO2 , among the richest in silica and most depleted in
Authors
John S. Pallister, Carl R. Thornber, Katharine V. Cashman, Michael A. Clynne, Heather Lowers, Charlie Mandeville, Isabelle K. Brownfield, Gregory P. Meeker
Trace elements in hydrothermal quartz: Relationships to cathodoluminescent textures and insights into vein formation Trace elements in hydrothermal quartz: Relationships to cathodoluminescent textures and insights into vein formation
High-resolution electron microprobe maps show the distribution of Ti, Al, Ca, K, and Fe among quartz growth zones revealed by scanning electron microscope-cathodoluminescence (SEM-CL) from 12 hydrothermal ore deposits formed between ???100 and e1750 ??C. The maps clearly show the relationships between trace elements and CL intensity in quartz. Among all samples, no single trace element
Authors
B.G. Rusk, H.A. Lowers, M.H. Reed